Headache in hypertension.
D000959:Antihypertensive Agents / Q000627:therapeutic use*; D002986:Clinical Trials as Topic; D006261:Headache / Q000209:etiology*; D006801:Humans; D006973:Hypertension / Q000150:complications* / Q000188:drug therapy*; D010919:Placebos
D000959:Antihypertensive Agents; D010919:Placebos